salt it sandy.
take the fillet, rub salt in both sides and leave it in your fridge for a few hours, up to a day, then when you want it, rinse off the salt then cook. it will be firmer and tasty, salt cod is traditional food for scandinavians and canadians etc. they have a point its lovely.
you could also easily smoke it yourself if you have a wok and a steamer. put your fish in the steamer on top of the wok, at the base of the wok put a good load of tea leaves and put them on the heat, once the tea leaves start smoking turn the heat down, it takes a few trys to get it right but its lovely too